Pow,
Welcome to the forum. Glad you found us but sorry you needed to look.
We have a "Search" box at the top of the page and if you type "focal prostate therapy" into it and click the "Search" button you will find quite a few discussion threads about
various treatments that fall under the "male lumpectomy" category. They go back quite a while and, as far as I know, none of the treatments that have been getting talked about
are exactly
new. There are a number of different treatments that can treat a small area of the prostate, trying to zap tumors while leaving the rest of the prostate in place and undamaged. High Intensity Focused Ultrasound can do it, as can cryotherapy (freezing) and radio-frequenct ablation (inserting a tiny little microwave oven with the door propped
open) and a number of other techniques.
My take on focal therapy is that all of these therapies have been bottled up, waiting for imaging technology to get good enough to allow accurate detection of smaller tumors -- and in some cases waiting for the FDA to be convinced that there is a benefit to treatment. (HIFU has recently been approved for treating prostate cancer in the US but I am not sure if it is being used focally -- as it could be -- or for full-gland ablation, for initial treatment or only for salvage.)
I bumped one interesting thread started by Tall Allen slightly over two years ago. Here's a link.
Focal therapy revisited